Problem 3.3 For each of the circuits shown in Fig. P3.2 a.) identify the resistors connected in parallel, b.) simplify the circuit by replacing the parallel-connected resistors with equivalent resistors. Problem 3.4 For each of the circuits shown in Fig. P3.2 a.) find the equivalent resistance seen by the source, b.) find the power developed by the source. 210Ω 280 N 24 N 36 N 18 ng 200 Ω 120Ω180 ΩΣ 18 V 30 mA (a) (b) 75 kN 50 kN 600 N 2 kl 65 V 60 V 100 kn 150 kNg 60 kN 900 ng 750 N 500 N: 21.5 kn 3 k 90 kN (c) (d) Fig. P3.2 Circuits for Problem 3.3 and 3.4
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
Problem 3.3 For each of the circuits shown in Fig. P3.2 a.) identify the resistors
connected in parallel, b.) simplify the circuit by replacing the parallel-connected
resistors with equivalent resistors.
Problem 3.4 For each of the circuits shown in Fig. P3.2 a.) find the equivalent
resistance seen by the source, b.) find the power developed by the source.
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